Johnson hardy



J. HARDY.

FURNACE DOOR.

APPLICATION man FEB. 18. 1919.

Patented Nov. 4, 1919.

UNITED STATES PATENT @FFTQE.

JOHNSON HARDY, OF WASHINGTON, DISTRICT OF COLUMBIA.

FURNAGE-DOOR.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed February 18, 1919. Serial No. 277,813.

character having a lining such as bricks,

blocks or other refractory material.

The object of the invention is to provide a furnace door comprising a'twopart outer shell or casing spaced apart and contannng an inner lining or wall of brick or blocks, and to furnish the outer face of such casing with means for connecting and adjusting said two parts for clamping the bricks or lining members according to expansion and contraction of the lining by reason of the heat from a furnace. 7

It is well known that expansion and contraction of the lining as of brick or block walls of furnace doors by reason of furnace heat causes the bricks or blocks to become loose and displaced, ordinarily necessitating removal of the doors for repairing, replacing and renewal of the wall or partsthereof. It is also well known that contlnuous dragging contact of the bricks or blocks with the door arch in raising and lowerlng the door in opening and closing movements, fracture and loosen the bricks or blocks. It is also well known that the bricks in the lower portion of such doors require more frequent renewal than those in the upper section. Therefore it is the purpose of this invention to prolong the life and usefulness of the bricks of both sections, to preserve the bricks intact with the lower section until the latter is eventually burned out, and to remove and replace the lower section and the bricks; thereof without removing the upper section or displacing the bricks of this section.

In the accompanying drawings forming part of this application:

Figure 1 is a front view of a furnace door, embodying my invention, partly broken away.

Fig. 2 is a vertical sectional view w1th draw bolts removed.

Fig. 3 is a perspective view of the twopart casing separated and showing their attachments disassembled.

Fig. 4 shows a modified form of draw bolt.

The same reference characters denote the same parts throughout the several views of the drawings.

In carrying out my invention I employ an outer metallic casing or shell comprising a'main upper section or door member 1, and a lower section or door member 2. The upper section 1 has an inclosing top 3 and ends a. The bottom and back of this section are open, and the ends 41 are provided with a lateral flange 5 adapted to overlap the sides of a furnacedoor-way. The lower section 2 is desirably of much less depth than the upper section and has the same shape as the upper section, with closed ends 6 and lateral flanges 7 corresponding with the ends and flanges of the upper section, but the top of the lower section is open and this section has a closed bottom 8. The bottom edge of the upper section and the top edge of the lower section have flanges 9 and 10 respectively, which overlap and thereby provide a space 11 between the sections for adjusting them vertically and for clamping the bricks or lining members as occasion may demand.

The outer or front face of each of the sections 1 and 2 is provided with a plurality of corresponding collars or lugs 12 each having abolt hole 13, and a similar lug 14: is

formed at the intersection of the ends and flanges of each section. Draw bolts 15 extend through the collars or lugs 12 and are provided with end nuts 15 and lock nuts 16. A nut 12, may be made central of the bolt 13 for turning the bolt as shown in Fig. 4.

After the sections are assembled and the draw bolts secured so as to leave the space 11, the lining as of bricks or blocks 17 is mortared or otherwise built into the casing formed by said sections. Obviously the overlapping flanges not only provide an interval or space between the sections for clamping the wall members or bricks but such overlapping precludes passage of air between the sections. It will be seen that the sections are free to be moved relative to each other upon operating the nuts, by reason of the lugs being without screw threads, thereby permitting free sliding movement of the lugs on the bolts.

Should any one or more of the bricks in either section become loose or unanchored the same may be tightened oranchored by merely operating the nuts so as to draw the sections closer together.

Should it be desired to remove one or more faulty or fractured brick and renew the same of either section, the nuts are merely operated, but in the event of the lower section burning out, it may be removed and replaced byanother without disabling the wall of the upper section or dis turbing the bricks thereof except the bricks adjacent to the bricks of the lower section wall.

In order to provide for the expeditious operation of this door and to insure vertical alinement in sliding the same in opening and closing movements, and also to afford means as part of the upper section free from injurious effects of furnace heat, I form a hanger head 18 central of the top 3 of the upper section. 1 and provide said head with a T-shaped slot 19, and a U-shaped opening '20. A hanger plate 21 fits said slot and has a neck 22 fitting said opening and connecting an eye 28 with the rear end of the plate 21. The device for removably securing the hanger plate in the head 18 comprises a set bolt 2-1 fitting a screw hole 25 in the head 18 or in the section top 3, and a flange or washer 26 held against the front end of th plate and head by said set bolt. Obviously this device may be changed from one door to the other having the hanger head thereon, and when properly placed, said eye is always in proper position for a hoisting chain hook such' as 27.

Obviously the number of lugs and draw bolts may be varied as desired or according to the size of doors, the size of the sections may be changed as desired, the sections may be multiplied as desired or as occasion may demand, the depth of the section flanges for the space 11 may be varied as desired, concrete or other suitable blocks may be substitut'e'd for the bricks, and various other details may be changed; therefore I do not wish to be understood as limiting the invention in these respects, nor in the material and in the application of the invention inconsistentwith the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1., A furnace door comprising a main upper casing, a lower removable casing separated from the upper casing by a space therebetween, lining members held by and within the casings nd extending over the space, and means for connecting and relatively sliding the casings by reason of said space, whereby the lining members may be clamped in relative position.

2. A furnace door comprising an upper casing and a lower casing, the adjacent edges of the casings having overlapping flanges affording a take-up space between the casings, a continuous lining retained by the casing and extending over the space, and take-up devices slid-ably connecting the casings for clamping the lining and parts thereof according to expansion and contraction.

In witness whereof I hereunto set my hand in the presence of two witnesses.

JOHNSON HARDY.

WVit-nesses J. Ross CALHOUN, O. T. BELT.

Copies oi this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

